as far as I know this is not in XR yet or on the ASR9000 for that matter. In the checks that I did before sending you an answer I see it being sporadically asked about but there was no real traction on it.
If you need to do translations, you could also leverage the CGN module (on the VSM/Virtual Services Module) to do some high scale high rate translations.
Introduction: The "external-out enable" command is available for
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